Day-night large-temperature-difference superfine aeolian sand roadbed with barren water source and construction method

Abstract

According to the day-night large-temperature-difference superfine aeolian sand roadbed for the barren water source and the construction method, a drainage blind ditch is formed by assembling various prefabricated products on site, the construction efficiency is improved, and the problems that in traditional construction of the drainage blind ditch, material management is difficult, and quality control is difficult are solved. A drainage blind pipe is arranged on the roadbed to merge seepage water into a drainage blind ditch, so that the roadbed construction quality is guaranteed; the virtual paving thickness measuring and controlling device is adopted, the virtual paving thickness is measured or controlled in a double-measuring mode on the virtual paving thickness measuring and controlling device, and accuracy and convenience of virtual paving thickness control are guaranteed. The geotextile laying trolley is arranged, semi-automatic geotextile laying is carried out through the trolley formed by a simple structure, the arranged triangular wheels can freely roll on scattered gravel soil, and the laying quality and efficiency of the geotextile are guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of roadbed, and in particular relates to an ultra-fine aeolian sand roadbed with poor water sources and large temperature difference between day and night and a construction method. Background Art

[0002] According to the principle of adapting measures to local conditions and using local materials, it is imperative to choose aeolian sand as roadbed filler, and it needs to be optimized through construction processes such as leveling, watering, and compaction to ensure the quality of roadbed filling. Aeolian sand needs to be watered before compaction to make its water content reach a suitable water content for compaction. Too little or too much watering will affect the moisture content of aeolian sand, and in the process of rolling with a roller, its surface moisture content is very easy to evaporate, resulting in a decrease in the moisture content of aeolian sand, which is easy to cause a decrease in compaction. Secondly, in the process of backfilling aeolian sand, due to the large-scale layered backfilling, its virtual paving thickness usually needs to be manually detected, and generally a tape measure is used to detect on the cross section, and the detection accuracy is low. In addition, in the process of laying geotextiles, manual laying is inefficient and difficult, which can easily reduce the quality of geotextile laying. There are still many issues that need to be studied in the construction of aeolian sand roadbed. In view of the above existing problems, it is urgent to propose an ultra-fine aeolian sand roadbed with poor water sources and large temperature difference between day and night and its construction method from the aspects of compaction, watering, geotextile laying, and virtual paving thickness control. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an ultra-fine aeolian sand roadbed with poor water resources and large temperature difference between day and night and a construction method.

[0004] The construction method of the ultra-fine aeolian sand roadbed with poor water resources and large temperature difference between day and night comprises the following steps:

[0005] Step 1: Install a corrugated pipe at the bottom of the groove through a prefabricated base, install a prefabricated frame outside the corrugated pipe, and backfill the first backfill layer and the second backfill layer in the groove;

[0006] Step 2: Lay drainage blind pipes along the roadbed longitudinally, and collect and flow the water into the drainage blind ditch;

[0007] Step 3: Carry out aeolian sand filling construction and use a watering mobile equipment for watering;

[0008] Step 4: Install a virtual paving thickness measurement control device around the backfill area, connect the water replenishment post-installation device to carry out water replenishment and compaction of the aeolian sand roadbed; and measure the compaction degree;

[0009] Step 5: Use the geotextile laying cart to lay the geotextile and press the top with gravel; use virtual laying thickness measurement control devices to be placed equidistantly around the capping area to control the thickness of the gravel laying.

[0010] Preferably, in step one, after excavating the trench, several prefabricated bases are installed at equal distances at the bottom of the trench, and then the corrugated pipe is placed on the prefabricated base; the bottom plate of the prefabricated frame is aligned with the bolt holes on the prefabricated base, and the prefabricated frame is installed on the prefabricated base by bolt connection; the prefabricated frame includes a first frame, a second frame, a scroll spring and a fixing rod, and several fixing rods are installed at equal distances on the first frame, one end of the scroll spring is installed on the fixing rod, and the other end is installed on the second frame; the geomembrane is wrapped around the second frame, and then the grid net is wrapped around the geomembrane, and finally the pressure strips on both sides are pressed into the groove and the nuts are tightened to fasten the geomembrane and the grid net, and finally the backfill construction of the first backfill layer and the second backfill layer is carried out.

[0011] Preferably, a number of drainage blind pipes wrapped with geomembrane are laid equidistantly along the longitudinal direction of the roadbed, and both ends of the drainage blind pipes are connected to a collecting pipe. The drainage blind pipes are set to collect seepage water, and the collecting pipe flows through the drainage pipe to the drainage blind ditch.

[0012] Preferably, in step three, after the surface is cleaned, aeolian sand filling construction is carried out. First, squares are spread on the surface, and the squares are filled with aeolian sand and then flattened. Then, a watering mobile device is used for watering. The watering mobile device includes universal wheels, a chassis, an operating table, a watering front device, a watering rear device, a watering tank and a water level sensor. The watering amount is set through the operating table so that the sprinkler head sprays water evenly to water the aeolian sand. Both the watering front device and the watering rear device are provided with a water pump and a water flow sensor. Before compaction, the virtual paving thickness measurement control device is equidistantly installed around the backfill area, and then the water pipes in the virtual paving thickness measurement control device are connected with water pipe joints and placed on both sides of the roadbed respectively. The water pipes and the watering rear device on both sides are connected with a tee, and the watering rear device is controlled by the operating table to replenish the aeolian sand roadbed with water. The construction personnel replenish the aeolian sand with water so that the aeolian sand roadbed recovers the designed moisture content before rolling it with a roller.

[0013] Preferably, the virtual paving thickness measurement and control device includes a handle, a base, a hollow fixed rod, a measuring rod, a ruler and a horizontal rod. By combining two sets of measuring tools, a single virtual paving thickness measurement or simultaneous control of the virtual paving thickness of backfill areas in all directions can be achieved.

[0014] Preferably, the virtual paving thickness of the backfill areas in all directions is controlled simultaneously, and the sleeve is pushed upward in advance to move the horizontal rod installed on the sleeve upward to the scale line on the ruler corresponding to the design value of the virtual paving thickness, and then the virtual paving thickness measurement and control device is placed equidistantly around the backfill area, and the backfill and virtual paving thickness are controlled according to the height of the horizontal rod.

[0015] Preferably, a fixing block is provided in the inner wall of the hollow fixed rod, a fastening ring is fixed on the outer wall of the measuring rod, and a spring is provided between the fastening ring and the fixing block. When measuring the virtual paving thickness, the base is placed at the top of the backfill area to be measured, and then the handle is held and pressed downward, the bottom of the rod passes through the base and penetrates into the backfill layer, and then the scale on the measuring rod is read, with the horizontal plane of the top of the ring as the reading point; after reading the scale, release your hands to release the pressure, and the measuring rod rebounds to its original position to complete a single virtual paving thickness measurement.

[0016] Preferably, the geotextile laying trolley includes a push rod, a disc, rollers, triangular wheels and a high-strength spring. The push rod is arranged at the front end of the disc, and a bottom rod is arranged at the rear end of the disc. The rollers and triangular wheels are respectively installed on the bottom of the push rod and the bottom rod. Roller support rods are installed on both sides of the trolley. One end of the high-strength spring is installed on the push rod, and the other end is installed on the roller support rod. A hook is installed on the upper part of the push rod for temporary fixation when the roller support rod is lifted. A container is installed on the disc near the triangular wheel for storing gravel and soil. An opening and closing plate is arranged at the bottom of the container, and the opening and closing of the opening and closing plate are controlled by arranging electric hydraulic rods on both sides of the opening and closing plate. In step five, the rollers with geotextile are installed on the roller support rods on both sides of the geotextile laying trolley, and then the hooks are separated from the lifting ears, and the roller support rods are lowered to make the geotextile stick to the surface of the aeolian sand, and then the geotextile laying trolley is pulled upside down to make the geotextile stick to the aeolian sand in a rolled manner, and at the same time, the opening and closing plates are opened to evenly sprinkle the gravel and soil in the container on the geotextile.

[0017] The superfine aeolian sand roadbed with poor water source and large temperature difference between day and night is obtained by any of the above-mentioned methods.

[0018] The beneficial effects of the present invention are:

[0019] 1) The present invention assembles drainage blind ditches on site through various prefabricated products, thereby improving construction efficiency and overcoming the problems of difficult material management and quality control of drainage blind ditches in traditional construction. Then, drainage blind pipes are set on the roadbed to collect seepage water into the drainage blind ditch, thereby ensuring the quality of roadbed construction.

[0020] 2) The present invention adopts a watering mobile device, which uses a watering front device and a water replenishing post device to water the aeolian sand and replenish water during the compaction process, thereby effectively ensuring the compaction degree of the aeolian sand roadbed.

[0021] 3) The present invention adopts a virtual paving thickness measurement and control device, and measures or controls the virtual paving thickness through a dual measurement method on the device, thereby ensuring the accuracy and convenience of virtual paving thickness control.

[0022] 4) The present invention is provided with a geotextile laying trolley, which is composed of a simple structure to carry out semi-automatic geotextile laying. The triangular wheels can roll freely on the spread gravel soil, thereby ensuring the laying quality and efficiency of the geotextile. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the aeolian sand roadbed structure and drainage of the present invention;

[0024] Figure 2 It is a cross-sectional view of the blind drainage ditch of the present invention;

[0025] Figure 3 It is a structural diagram of a drainage blind ditch of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the mobile water sprinkler device of the present invention;

[0027] Figure 5 It is a schematic diagram of on-site water replenishment of the present invention;

[0028] Figure 6 It is a vertical view of the virtual paving thickness measurement control device of the present invention;

[0029] Figure 7 It is a schematic diagram of debugging the horizontal rod of the virtual paving thickness measurement control device of the present invention;

[0030] Figure 8 It is a schematic diagram of measuring virtual paving thickness by the virtual paving thickness measurement control device of the present invention;

[0031] Fig. 9 It is a schematic diagram of the internal structure of the hollow fixing rod of the present invention;

[0032] Fig.10 This is a vertical view of the geotextile installation vehicle of the present invention;

[0033] Fig.11 It is a schematic diagram of laying geotextile of the present invention.

[0034] Explanation of reference numerals: 1. aeolian sand; 2. top capping layer; 3. geotextile; 4. drainage blind ditch; 5. drainage blind pipe; 6. collecting pipe; 7. drainage pipe; 8. prefabricated base; 9. prefabricated frame; 10. corrugated pipe; 11. first backfill layer; 12. second backfill layer; 13. bottom plate; 14. first frame; 15. second frame; 16. fixing rod; 17. scroll spring; 18. geomembrane; 19. grille; 20. bolt; 21. pressure strip; 22. groove; 23. chassis; 24. operating table; 25. universal wheel; 26. sprinkler front device; 27. water replenishment rear device; 28. sprinkler head; 29. ​​water flow sensor; 30. water pump; 31. water tank; 3 2. Water level sensor; 33. Sprinkler mobile equipment; 34. Water mist nozzle; 35. Water pipe; 36. Water pipe joint; 37. Aeolian sand roadbed; 38. Handle; 39. Base; 40. Measuring rod; 41. Ring; 42. Hollow fixed rod; 43. Horizontal rod; 44. Ruler; 45. Rod bottom; 46. Reading place; 47. Scale; 48. Spring; 49. Fixed block; 50. Fastening ring; 51. Push rod; 52. Disc; 53. Bottom rod; 54. Roller; 55. Triangular wheel; 56. Roller support rod; 57. Roller; 58. Hook; 59. Lifting ear; 60. High-strength spring; 61. Container; 62. Electric hydraulic rod; 63. Opening and closing plate; 64. Gravel soil. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0036] Embodiment 1

[0037] As an example, Figures 1 to 11 As shown, the construction method of the ultra-fine aeolian sand roadbed with poor water resources and large temperature difference between day and night includes the following steps:

[0038] Step 1: Drainage blind ditch installation

[0039] like Figure 2 and Figure 3As shown, after the trench is dug and leveled, several prefabricated bases 8 are installed at equal distances at the bottom of the trench, and then the corrugated pipe 10 is placed on the prefabricated base 8, and the bottom plate 13 of the prefabricated frame 9 is aligned with the bolt 20 holes on the prefabricated base 8, and the prefabricated frame 9 is installed on the prefabricated base 8 through the bolts 20. The geomembrane 18 is wrapped around the second frame 15, and then the grid net 19 is wrapped around the geomembrane 18, and finally the pressure strips 21 on both sides are pressed against the grooves 22 and the nuts are tightened to fasten the geomembrane 18 and the grid net 19, and finally the backfill construction of the first backfill layer 11 and the second backfill layer 12 is carried out.

[0040] Step 2: Install drainage blind pipe

[0041] like Figure 1 As shown, before the aeolian sand 1 is filled, a number of drainage blind pipes 5 wrapped with geomembrane 18 are laid equidistantly along the longitudinal direction of the roadbed. The two ends of the drainage blind pipes 5 are connected to the collecting pipe 6, and the collecting pipe 6 flows into the drainage blind ditch 4 through the drainage pipe 7.

[0042] Step 3: Sprinkling water on wind-blown sand

[0043] After the surface is cleaned, the aeolian sand 1 is filled. First, squares are spread on the surface, and then the soil is unloaded by reversing. After the squares are filled, the bulldozer is used to flatten them. Then, a watering mobile device 33 is used for watering. The watering amount is set through the operating table 24, so that the sprinkler head 28 sprays water evenly to sprinkle the aeolian sand 1.

[0044] Step 4: Compacting wind-blown sand

[0045] Before compaction, the virtual paving thickness measuring control device with the height of the horizontal rod 43 is installed equidistantly around the backfill area, and then the water pipe 35 is connected with the water pipe 35 joint and placed on both sides of the roadbed. The water pipes 35 and the water replenishment post-device 27 on both sides are connected by a tee, and the water replenishment post-device 27 is controlled by the operating table 24 to replenish water to the aeolian sand roadbed 37. The construction personnel replenish water to the aeolian sand 1, so that the aeolian sand roadbed 37 can be rolled by the roller after the designed water content is restored.

[0046] Step 5: Compaction test

[0047] After compaction is completed, the virtual paving thickness measurement control device is used to measure the compaction degree. The base 39 is placed at the top of the backfill area to be measured, and then the handle 38 is held and pressed down. The rod bottom 45 passes through the base 39 and goes deep into the backfill layer. Then the scale 47 on the measuring rod 40 is read, and the horizontal plane at the top of the collar 41 is the reading point 46. After reading, release both hands to release the pressure, and the measuring rod 40 rebounds to its original position, completing a single virtual paving thickness measurement.

[0048] Step 6: Geotextile laying

[0049] After the roadbed backfill layer is laid, the geotextile 3 is laid. The roller 57 with the geotextile 3 is installed on the roller 57 support rod 56 on both sides of the geotextile laying trolley. Then the hook 58 is separated from the lifting ear 59, and the roller 57 support rod 56 is lowered to make the geotextile 3 stick to the aeolian sand. Then the geotextile laying trolley is pulled upside down to make the geotextile 3 stick to the aeolian sand in a rolled manner. At the same time, the opening and closing plate 63 is opened to evenly sprinkle the gravel soil 64 in the container 61 on the geotextile 3 to ensure the compression and fixation of the geotextile 3 and prevent the geotextile 3 from moving.

[0050] Step 7: Top-covering construction

[0051] After the geotextile 3 is laid, the gravel soil 64 is pressed to complete the construction of the capping layer 2. The virtual paving thickness measurement control device is also placed equidistantly around the capping area to control the paving thickness of the gravel soil 64.

[0052] Embodiment 2

[0053] As another embodiment, this embodiment 2 proposes, on the basis of the embodiment 1, a more specific method for constructing an ultra-fine aeolian sand roadbed with poor water resources and large temperature difference between day and night:

[0054] In step one, if Figure 3 As shown, the prefabricated frame 9 is composed of a first frame 14, a second frame 15, a spiral spring 17 and a fixing rod 16. A plurality of fixing rods 16 are equidistantly installed on the first frame 14. One end of the spiral spring 17 is installed on the fixing rod, and the other end is installed on the second frame 15.

[0055] The provision of the prefabricated skeleton 9 reduces the negative impact of the upper pressure on the bellows 10 and enhances the structural strength of the bellows 10 .

[0056] In step 2, preferably, since the aeolian sand 1 has strong water permeability, after watering, the water seeps downward, and this part of the water can be collected by setting a drainage blind pipe 5 and flow into the drainage blind ditch 4.

[0057] In step three, if Figure 4 and Figure 5 As shown, specifically, the watering mobile device 33 is composed of a universal wheel 25, a chassis 23, an operating table 24, a watering pre-device 26, a water replenishing post-device 27, a water tank 31, a water level sensor 32, etc., wherein the watering pre-device 26 is used for watering the aeolian sand 1, and the water replenishing post-device 27 is used for replenishing water to the aeolian sand 1 due to evaporation of water during the compaction process.

[0058] The pre-watering device 26 and the post-watering device 27 are both provided with a water pump 30 and a water flow sensor 29. The water flow sensor 29 is mainly used to accurately control the amount of watering or water replenishment to ensure the compaction of the roadbed.

[0059] In step 4, if Figures 6 to 8 As shown, specifically, when the virtual paving thickness of the backfill areas in each direction is controlled simultaneously, the collar 41 is pushed upward in advance to move the horizontal rod 43 installed on the collar 41 upward to the scale line 47 on the ruler 44 corresponding to the virtual paving thickness design value, and then the virtual paving thickness measurement and control device is placed equidistantly around the backfill area, and then the backfilling work is carried out, and the virtual paving thickness is controlled according to the height of the horizontal rod 43.

[0060] The water mist nozzle 34 on the water pipe 35 is inclined 45 degrees toward the roadbed, and the aeolian sand 1 is evenly covered by the water mist through water mist spraying.

[0061] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0062] Embodiment 3

[0063] As another embodiment, this embodiment 3 proposes, based on the first and second embodiments, a more specific method for constructing an ultra-fine aeolian sand roadbed with poor water resources and large temperature difference between day and night:

[0064] In step five, specifically, the virtual paving thickness measurement and control device includes a handle 38, a base 39, a hollow fixed rod 42, a measuring rod 40, a ruler 44 and a horizontal rod 43. By combining two sets of measuring tools, a single virtual paving thickness measurement or simultaneous control of the virtual paving thickness of backfill areas in all directions can be achieved.

[0065] Among them, the rebound of the measuring rod 40 is mainly attributed to the spring 48 arranged in the inner wall of the hollow fixed rod 42. One end of the spring 48 is arranged on the fixed block 49 embedded in the inner wall of the hollow fixed rod 42, and the other end is installed on the fastening ring 50. The fastening ring 50 is installed on the measuring rod 40 and moves downward with the measuring rod 40, thereby driving the extension of the spring, and then the fastening ring 50 is pulled upward through the rebound of the spring 48, driving the measuring rod 40 to rebound together.

[0066] In step six, if Fig.10 and Fig.11 As shown, when installing the geotextile laying trolley, first connect the push rod 51 with a handle to the wheel plate 52, then install the roller 54 and the triangular wheel 55 on the bottom of the push rod 51 and the bottom rod 53 respectively, and the triangular wheel 55 can roll freely on the spread gravel 64. Then install the roller 57 support rod 56 on both sides of the trolley, one end of the high-strength spring 60 is installed on the push rod 51, and the other end is installed on the roller 57 support rod 56, and the upper part of the push rod 51 is installed with a hook 58.

[0067] Furthermore, a container 61 is installed on the undercarriage 52 near the triangular wheel 55 for storing gravel and soil 64, and an opening and closing plate 63 is arranged at the bottom thereof. The opening and closing of the opening and closing plate 63 are controlled by arranging electric hydraulic rods 62 on both sides of the opening and closing plate 63.

[0068] It should be noted that the parts in this embodiment that are the same or similar to those in Embodiments 1 and 2 can be referenced to each other and will not be described in detail in this application.

[0069] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A construction method for an ultra-fine aeolian sand roadbed with poor water resources and large temperature difference between day and night, characterized in that: The following steps are involved: Step 1: Install a corrugated pipe at the bottom of the groove through a prefabricated base, install a prefabricated frame outside the corrugated pipe, and backfill the first backfill layer and the second backfill layer in the groove; Step 2: Lay drainage blind pipes along the roadbed longitudinally, and collect and flow the water into the drainage blind ditch; Step 3: Carry out aeolian sand filling construction and use a watering mobile equipment for watering; Step 4: Install a virtual paving thickness measurement control device around the backfill area, connect the water replenishment post-installation device to carry out water replenishment and compaction of the aeolian sand roadbed; and measure the compaction degree; Step 5: Lay the geotextile using the geotextile laying cart and press the top with gravel soil; Virtual paving thickness measurement control devices are placed at equal intervals around the capping area to control the thickness of the gravel soil paving.

2. The construction method of the water-poor, day-and-night temperature-difference ultra-fine aeolian sand roadbed according to claim 1 is characterized in that: In step one, after excavating the trench, several prefabricated bases are installed at equal distances at the bottom of the trench, and then the corrugated pipe is placed on the prefabricated base; the bottom plate of the prefabricated frame is aligned with the bolt holes on the prefabricated base, and the prefabricated frame is installed on the prefabricated base by bolt connection; the prefabricated frame includes a first frame, a second frame, a scroll spring and a fixing rod, and several fixing rods are installed at equal distances on the first frame, one end of the scroll spring is installed on the fixing rod, and the other end is installed on the second frame; the geomembrane is wrapped around the second frame, and then the grid net is wrapped around the geomembrane, and finally the pressure strips on both sides are pressed into the groove and the nuts are tightened to fasten the geomembrane and the grid net, and finally the backfill construction of the first backfill layer and the second backfill layer is carried out.

3. The construction method of the water-poor, day-and-night temperature-difference ultra-fine aeolian sand roadbed according to claim 1 is characterized in that: Several drainage blind pipes wrapped with geomembrane are laid equidistantly along the longitudinal direction of the roadbed. Both ends of the drainage blind pipes are connected to the collecting pipes. The drainage blind pipes are set to collect the seepage water, which flows into the drainage blind ditch through the drainage pipes.

4. The construction method of the water-poor, day-and-night temperature-difference ultra-fine aeolian sand roadbed according to claim 1 is characterized in that: In step three, after the surface is cleaned, aeolian sand filling construction is carried out. First, squares are spread on the surface, and the squares are filled with aeolian sand and then flattened. Subsequently, a watering mobile device is used for watering. The watering mobile device includes universal wheels, a chassis, an operating table, a watering front device, a watering rear device, a watering tank and a water level sensor. The watering amount is set through the operating table so that the sprinkler head sprays water evenly to water the aeolian sand. Both the watering front device and the watering rear device are provided with a water pump and a water flow sensor. Before compaction, the virtual paving thickness measurement control device is installed equidistantly around the backfill area, and then the water pipes in the virtual paving thickness measurement control device are connected with water pipe joints and placed on both sides of the roadbed. The water pipes and the watering rear device on both sides are connected with a tee, and the watering rear device is controlled by the operating table to replenish the aeolian sand roadbed with water. The construction personnel replenish the aeolian sand with water so that the aeolian sand roadbed recovers the designed moisture content before rolling it with a roller.

5. The construction method of the water-poor, day-and-night temperature-difference ultra-fine aeolian sand roadbed according to claim 1 is characterized in that: The virtual paving thickness measurement control device includes a handle, a base, a hollow fixed rod, a measuring rod, a ruler and a horizontal rod. Through the combination of two sets of measuring tools, a single virtual paving thickness measurement or simultaneous control of the virtual paving thickness of backfill areas in all directions can be achieved.

6. The construction method of the water-poor, day-and-night temperature-difference ultra-fine aeolian sand roadbed according to claim 5 is characterized in that: The virtual thickness of backfill areas in all directions is controlled simultaneously. The sleeve ring is pushed upward in advance to move the horizontal rod installed on the sleeve ring upward to the scale line on the ruler corresponding to the design value of the virtual thickness. The virtual thickness measurement and control device is then placed equidistantly around the backfill area, and the backfill and virtual thickness are controlled according to the height of the horizontal rod.

7. The construction method of the water-poor, day-and-night temperature-difference ultra-fine aeolian sand roadbed according to claim 5 is characterized in that: A fixing block is provided in the inner wall of the hollow fixed rod, a fastening ring is fixed on the outer wall of the measuring rod, and a spring is provided between the fastening ring and the fixing block. When measuring the virtual paving thickness, the base is placed at the top of the backfill area to be measured, and then the handle is held and pressed down. The bottom of the rod passes through the base and goes deep into the backfill layer. Then read the scale on the measuring rod, with the horizontal plane of the top of the ring as the reading point; after reading the scale, release your hands to release the pressure, and the measuring rod rebounds to its original position to complete a single virtual paving thickness measurement.

8. The construction method of the water-poor, day-and-night temperature-difference ultra-fine aeolian sand roadbed according to claim 1 is characterized in that: The geotextile laying trolley comprises a push rod, a disc, a roller, a triangular wheel and a high-strength spring. The push rod is arranged at the front end of the disc, and a bottom rod is arranged at the rear end of the disc. The roller and the triangular wheel are respectively installed on the bottom of the push rod and the bottom rod. Roller support rods are installed on both sides of the trolley. One end of the high-strength spring is installed on the push rod, and the other end is installed on the roller support rod. A hook is installed on the upper part of the push rod for temporary fixation when the roller support rod is lifted. A container is installed on the disc near the triangular wheel for storing gravel and soil. An opening and closing plate is arranged at the bottom of the container. The opening and closing of the opening and closing plate are controlled by arranging electric hydraulic rods on both sides of the opening and closing plate. In step five, the roller with the geotextile is installed on the roller support rods on both sides of the geotextile laying trolley, and then the hook is separated from the lifting ear, and the roller support rod is lowered to make the geotextile stick to the surface of the aeolian sand, and then the geotextile laying trolley is pulled upside down to make the geotextile stick to the aeolian sand in a rolling manner, and at the same time, the opening and closing plate is opened to evenly sprinkle the gravel and soil in the container on the geotextile.

9. Water-poor, large temperature difference between day and night, ultra-fine aeolian sand roadbed, characterized by: Obtained by the method described in any one of claims 1 to 8.

Images